Arm64 configuration alwas hangs early in build

arm64 seems quite flaky - used to work, sort of, but now, my build simply
never finshes:

https://travis-ci.org/github/GrokImageCompression/grok/jobs/704649365

I get this message in the console:

sudo: unable to resolve host travis-job-grokimagecompr-grok-704649365: Name or service not known

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